Electric Current and Its Effect Worksheet-1

Electric Current and Its Effect Worksheet-1

1. Shown below are four cells fixed on a board.

The correct connection of their terminals to make a battery of four cells is

(a)

(b)

(c)

(d)

2. Which of these is not circuit element?

(a) Battery                                      (b) Voltmeter

(c) Potential difference               (d) Resistor

3. When the switch of an electric bell is pushed

(a) Flow of the current stops through the electromagnet in the bell

(b) A current starts to flow through the electromagnet

(c) Voltage decreases in the current flowing through the electromagnet

(d) None of these

4. When electric current is flown through a conductor, some amount of

(a) Electrical energy is converted into heat energy

(b) Electrical energy is converted into mechanical energy

(c) Mechanical energy is converted into electrical energy

(d) Heat energy is converted into electrical energy

5. When the strength of the current flowing through a coil is increased

(a) Strength of the magnetic field decreases

(b) Strength of the magnetic field increases

(c) Amount of heat generated due to resistance decreases

(d) Strength of the magnetic field remains constant

6. The magnetic field around a current-carrying coil lasts

(a) For three hours

(b) As long as current flows through it

(c) Till its half-life period

(d) Field is permanent

7. A wire twisted many times in the form of circles is called

(a) Coil

 (b) Fuse

(c) Electromagnet

(d) Circuit

8. The necessary requirement for a fuse wire is

(a) Conductor with low melting point

(b) Conductor with high melting point

(c) Insulator with low melting point

(d) Insulator with high melting point

9. Who discovered magnetic effect of current?

(a) H.C. Oersted                           (b) Michael Faraday

(c) Ohm                                          (d) Flemming

10. Which of the following is not a source of electric current?

(a) Car Battery

(b) Dry Cell

(c) Dynamo

(d) Electromagnet

Answer Key:

1. (a)
2. (c)
3. (b)
4. (a)
5. (b)
6. (b)
7. (a)
8. (a)
9. (a)
10. (d)